it depends, how old are you, are your parents deceased or are they retired or on disability? and did your disabling conditions start before your turned 22? i took this off social security website. www.ssa.gov.

An adult disabled before age 22 may be eligible for child’s benefits if a parent is deceased or starts receiving retirement or disability benefits. We consider this a “child’s” benefit because it is paid on a parent’s Social Security earnings record.

We make the disability decision using the disability rules for adults.

The “adult child”—including an adopted child, or, in some cases, a stepchild, grandchild, or stepgrandchild—must be unmarried, age 18 or older, and have a disability that started before age 22.

there is alot more info, so click on this link:
http://www.ssa.gov/dibplan/dacpage.shtml

remember that it's not just your tremors or whatever ailments you have, it's how they affect your life, and also how your medications affect you.

i'm not sure, but you might be able to get ssi, which is different from ssdi. this is what social security's website says about ssi:
Supplemental Security Income (SSI) is a Federal income supplement program funded by general tax revenues (not Social Security taxes):


It is designed to help aged, blind, and disabled people, who have little or no income; and

It provides cash to meet basic needs for food, clothing, and shelter go here to read up on it:

http://www.ssa.gov/notices/supplemen...curity-income/